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- 1. Multiple Choice
What two subatomic particles are found in an atom's nucleus?
Protons and neutrons
neutrons and electrons
electrons and protons
- 2. Multiple Choice
What does the graph show is needed to keep the nucleus stable?
As protons increases, more neutrons are needed.
As protons increases, less neutrons are needed.
As neutrons increase, less protons are needed.
- 3. Multiple Choice
What is likely to happen to unstable nuclei with too many, or too few, neutrons?
They will decay by emitting radiation.
They will loose all their electrons.
They will bond with other atoms.
- 4. Multiple Choice
What could an unstable nucleus emit?
Alpha, gamma, beta, and sometimes a neutron.
Alpha, beta, gamma, and sometimes delta
Alpha, beta, delta, and sometimes gamma
- 5. Multiple Choice
If the nucleus has too few neutrons, it will emit two protons and two neutrons called ___________.
an alpha particle
a beta particle
a neutron
gamma radiation
- 6. Multiple Choice
Alpha decay causes the mass number of the nucleus to decrease by ________ and the atomic number of the nucleus to decrease by _______.
four, two
two, four
one, two
two, three
- 7. Multiple Choice
Which symbol(s) represent an alpha particle?
yellow
blue
red
- 8. Multiple Choice
Which symbol(s) represent an beta particle?
yellow
blue
red
- 9. Multiple Choice
Which symbol(s) represent gamma radiation?
yellow
blue
red
- 10. Multiple Choice
If the nucleus has too many neutrons, a neutron will turn into a proton and emit a fast-moving electron. This process is known as ___________.
alpha radiation
beta radiation
gamma radiation
neutron radiation
- 11. Multiple Choice
Beta radiation is ____________________
an electron from an electron shell.
an electron from the nucleus.
two protons and two neutrons.
a high frequency electromagnetic wave.
- 12. Multiple Choice
What will happen if the nucleus has too many neutrons?
A neutron will turn into a proton and emit a fast-moving electron.
A proton will turn into a neutron and emit a fast-moving electron.
A neutron will break into two and emit a fast-moving alpha particle.
- 13. Multiple Choice
What observation suggests the atom is mostly empty space?
Most alpha particle travel straight through.
Some alpha particles are deflected at small angles.
Occasionally an alpha particle come straight back.
- 14. Multiple Choice
After emitting an alpha or beta particle, how may a nucleus lose excess energy?
Releasing a neutron
Releasing gamma radiation
Emitting Infra-red radiation
- 15. Multiple Choice
Which form of radioactive decay is the most ionising?
Alpha
Beta
Gamma
- 16. Multiple Choice
Occasionally a neutron can be emitted by radioactive decay. Which process will not result in neutron emission?
Absorbing cosmic rays in the atmosphere.
Firing alpha particles at Beryllium.
Nuclear fission reactions.
Nuclear fusion reactions.
- 17. Multiple Choice
What type of radiation is the most penetrating?
Alpha
Beta
Gamma
- 18. Multiple Choice
What subatomic particle determines the name of the element?
Electron
Proton
Neutron
Boson
- 19. Multiple Choice
What observation suggests the nucleus of the atom is positively charged?
Most alpha particle travel straight through.
Some alpha particles are deflected at small angles.
Occasionally an alpha particle come straight back.
- 20. Multiple Choice
What observation suggests the nucleus carries almost all of the atom's mass?
Most alpha particle travel straight through.
Some alpha particles are deflected at small angles.
Occasionally an alpha particle come straight back.
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